Poorice can be whatever you want it to be. But there is a catch. Poorice can be whatever you want it to be, EXCEPT FOR POORICE. Poorice can be a noun, an adjective, a verb, an adverb, a metaphor, a simile... anything. It just can't be poorice.

Confused: You say poorice can be whatever you want it to be...
Explainee: Except for poorice... :)
Confused: Yes. But what IS poorice?
Explainee: Whatever you want it to be, except for poorice :) duh.
Confused: BUT WHAT IS POORICE?
Explainee: Eurgh, give up.